![]() ![]() ![]() ![]() Typically, you can see a few hp gains from swapping out the exhaust due to either an increase in diameter, or in flow rate, allowing the engine to spit out its post combustion gas more effectively leaving less residual gas in the chamber (reduction in backpressure). The only thing the exhaust does is channel the flow of exhaust gases out in a controlled manner. It does not change the amount of fuel/air in the chambers, or the compression ratio. The exhaust pipe itself, merits no additional horsepower. Given that we have no access to those documents, let me try my best.Īdding an aftermarket exhaust does not change anything other than the exhaust itself, this seems like a simple statement but allow me to elaborate. There seems to be a lot of questionable logic and here-say thrown about when it comes to aftermarket exhausts, and I would love to hear one of the development engineers offer up their technical paper on it. Id say it does more harm then good getting a full system without proper tuning (plus its expensive getting a full system but we are pretty limited for slipon options!) - if you just want looks and noise then maybe just get a slip on? That being said many people dont run ECU flashes or fuel controllers and they feel their bike is ok - maybe im just being picky. I ran my S1R on this bike without a fuel controller for a while and it was ok but it had power inconsistencies and popped like crazy which made the torque and power curve all over the shop - I dont like the feeling my bike isnt 'just right' so I wouldnt do it for a long time. If your going a slip on option then a fuel controller or flash isnt really required as you arent getting increased airflow so you are just getting looks and a loud exhaust. Forgetting the obvious power you'd be missing out on, most aftermarket full systems are straight through so you are going to get a truck load of popping as most if not all stock bikes run lean for emissions requirements and you just make it worse by adding a full system as airflow is increased due to less resistance. My bike has over 9k on it, and more miles will be racked up soon, there will be plenty of opportunity to do mileage checks, under many different conditions.īoth of our bikes, have the stock exhaust in place.Īs others have said, "best bang for the buck" *just the improved smoothness alone, was worth the $, but more importantly, the neck snapping response in A mode, is the home run.A PC (or other fuel controller) that has been tuned/mapped for an exhaust or a ECU tune is nearly always recommended by exhaust suppliers but its not a necessity. There was mention, that the gas mileage may drop with the optimized fueling, when watching the average MPG readout today, it did not show any drastic change. STD mode was even smoother than the 2015 flash. With the vcyclenut work today: A mode is rip & tear, all the way.even impressive in the higher gears. It was great, to have had experience riding with the 3 different ECM maps, original, 2015 updated map, and today with the vcyclenut map. STD mode is much smoother than the factory 2015 re-flash (*a big improvement from the original), that the Dealer had installed about a month ago. I took a 50 mile test ride this afternoon. David did an excellent job, of informing us, about what to expect with the re-flash changes. ![]()
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